Stars A and B are both black holes but have different masses. If the mass of star A is twice as much as the mass of star B, the average density of star A, compared to the average density of star
B will be
A) the same.
B) half as much.
C) one-fourth as much.
D) four times as much.
E) twice as much.

Question

Quizplus · Accepted Answer

The average density of a black hole is inversely proportional to the square of its mass. If star A has twice the mass of star B, its average density will be one-fourth that of star B.

Stars a and B Are Both Black Holes but Have